https://doi.org/10.1140/epjc/s10052-017-4748-2
Regular Article - Theoretical Physics
decay in the aligned two-Higgs-doublet model
Institute of Particle Physics and Key Laboratory of Quark and Lepton Physics (MOE), Central China Normal University, Wuhan, 430079, Hubei, China
* e-mail: xqli@mail.ccnu.edu.cn
Received:
3
January
2017
Accepted:
9
March
2017
Published online:
25
March
2017
In the aligned two-Higgs-doublet model, we perform a complete one-loop computation of the short-distance Wilson coefficients 
, which are the most relevant ones for 
transitions. It is found that, when the model parameter 
is much smaller than 
, the charged scalar contributes mainly to chirality-flipped 
, with the corresponding effects being proportional to 
. Numerically, the charged-scalar effects fit into two categories: (A) 
are sizable, but 
, corresponding to the (large , small ) region; (B) 
and 
are sizable, but 
, corresponding to the (small , large ) region. Taking into account phenomenological constraints from the inclusive radiative decay 
, as well as the latest model-independent global analysis of data, we obtain the much restricted parameter space of the model. We then study the impact of the allowed model parameters on the angular observables 
and 
of 
decay, and we find that could be increased significantly to be consistent with the experimental data in case B.
© The Author(s), 2017
